ZyXEL Communications IES-1248-51 Guía de usuario descargar pdf (Pagina 319)

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Chapter 45 VoIP

IES-1248-51V User’s Guide

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45.1.3 H.248 Commands

In an H.248 network, the MGC controls calls by issuing commands to the Media

Gateways. In turn, the media gateways can issue reports to the MGC. The

commands allow control of Terminations and Contexts. For example, the MGC can

specify what events a Termination should log and report, which Terminations

should exist in which Contexts, and which signals the MG should apply to a

Termination.

Commands and reports are grouped into Transactions. Each Transaction consists

of a number of actions, which must all refer to the same Context. To verify that

Transactions have been correctly sent and received, each Transaction must be

preceded by a TransactionRequest message and concluded with a

TransactionReply message. In addition, a TransactionPending message indicates

that a Transaction has been initiated, and is being processed, but is not complete.

The following table lists the H.248 commands.

45.1.4 H.248/MEGACO Call Progression Example

The following figure shows two analog telephones (A and B) connected to two

media gateways (MG1 and MG2). MG1 and MG2 are connected to one another

via an IP network. MG1 and MG2 are controlled by the media gateway controller

MGC.

Table 110 H.248/MEGACO Commands

COMMAND DESCRIPTION

Add Adds a Termination to a Context. If a Termination does not

already exist, it is created by this command.

Modify Alters a Termination’s events, properties and signals.

Subtract Removes a Termination from a Context and sends statistics to the

MGC on the Termination’s activities in the Context. Ephemeral

Terminations are destroyed by this command.

Move Moves a Termination from one Context to another.

AuditValue Sends information on a Termination’s current events, properties

and signals.

AuditCapabilities Sends information on all possible properties, events and signals

permitted by the MG.

Notify Sent by the MG to the MGC to inform the MGC of events.

ServiceChange Sent by the MG to the MGC, or vice versa, indicating that one or

more Terminations is about to be removed from service, or has

been returned to service.

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